The idea here is that there is a '1 - many ' relationship between `table_a` and `table_b` but in fact we want to get a '1 - 1' relationship (because our subquery garuntees only the record with the latest ctime is returned, if 2 table_b records have the same time ignore 2nd one onwards).

I would like to be able to do this with the ORM. I can do the sql using FindParams (although it is a bit arduous), but I don't know how to get the returned data into objects (so I could do